1656623 has 4 divisors (see below), whose sum is σ = 1663008. Its totient is φ = 1650240.

The previous prime is 1656617. The next prime is 1656631. The reversal of 1656623 is 3266561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1656623 - 2⁴ = 1656607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2786 + ... + 3327.

It is an arithmetic number, because the mean of its divisors is an integer number (415752).

2^1656623 is an apocalyptic number.

1656623 is a deficient number, since it is larger than the sum of its proper divisors (6385).

1656623 is an equidigital number, since it uses as much as digits as its factorization.

1656623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6384.

The product of its digits is 6480, while the sum is 29.

The square root of 1656623 is about 1287.0986753159. The cubic root of 1656623 is about 118.3244684668.

The spelling of 1656623 in words is "one million, six hundred fifty-six thousand, six hundred twenty-three".